超声波-微波对杉木锯屑液化的强化效应研究  

Intensification Effect of Ultrasonic-microwave on Liquefaction of Fir Sawdust

作　　者：赵宇 闫璟玮 杨义媛 李可莹 朱亨基 卢泽湘[1] ZHAO Yu;YAN Jingwei;YANG Yiyuan;LI Keying;ZHU Hengji;LU Zexiang(College of Material Engineering,Fujian Agriculture and Forestry University,Fuzhou 350002,China)

机构地区：[1]福建农林大学材料工程学院,福建福州350002

出　　处：《林产化学与工业》2022年第1期87-94,共8页Chemistry and Industry of Forest Products

基　　金：国家自然科学基金青年基金项目(41907112);福建省自然科学基金面上项目(2017J01569)。

摘　　要：以正辛醇为溶剂、浓硫酸为催化剂,探讨了超声波-微波(UW-MW)辅助对杉木锯屑液化的强化作用,考察了工艺参数的影响,并对液化产物进行了表征分析。研究结果表明:超声波-微波具有很好的传质传热强化效应,与传统液化相比,杉木锯屑超声波-微波辅助液化反应时间从60 min缩短至20 min,液化率提高了5.24%。在溶剂与锯屑质量比值6、催化剂H_(2)SO_(4)浓度0.6 mol/L时,杉木锯屑液化率达到64.30%;适当添加γ-戊内酯可提高液化率,γ-戊内酯用量40%时液化率达81.17%。液化过程中,少量熔融状物质沉积在残渣(SR)表面,阻碍了原料的进一步液化;纤维素与半纤维素的降解产物主要为小分子糖类等物质,富集在水相产物(WS)中;木质素的降解产物主要由芳香族等物质组成,分布在生物油(BO)产物中。The intensification effect of ultrasonic-microwave(UW-MW)assisted on the liquefaction of fir sawdust was discussed by using n-octanol as a solvent and sulfuric acid as a catalyst.The influence of process parameters on the liquefaction ratio was investigated,and the liquefied products were characterized and analyzed.The experimental results showed that ultrasonic-microwave had a good effect on the mass and heat transfer enhancement effect.Compared with the traditional liquefaction,the reaction time of sawdust ultrasonic-microwave assisted liquefaction was shortened from 60 min to 20 min,and the liquefaction ratio increased by 5.24%.Under the conditions of the mass ratio of solvent to sawdust of 6,the concentration of catalyst of 0.6 mol/L,the liquefaction rate of sawdust reached 64.30%,and the proper addition ofγ-valerolactone could increased the liquefaction rate to 81.17%.In the liquefaction process,a little molten materials gradually deposited on the surface of the solid-residue product(SR),which hindered the further liquefaction of the fir sawdust.The most of degradation products of cellulose and hemicelluloses in the sawdust were mainly small-molecule sugars etc.which were enriched in the water-soluble product(WS).The degradation products of lignin were mainly composed of aromatic etc.substances which were distributed in the bio-oil product(BO).

关 键 词：杉木锯屑 液化 超声波 微波 强化 

分 类 号：TQ35[化学工程]